IAudioSessionNotification，人有工作code？ [英] IAudioSessionNotification, anyone have working code?

问题描述

我捡一些实验code，我用了Windows 7的测试版现在，我已经安装了RC搞乱。

I'm picking up some experimental code I was messing with in the Windows 7 Beta now that I've installed the RC.

基本上，我试图让 IAudioSessionManager2 ＆安培; IAudioSessionNotification 一起工作的通知创建的每个新的音频会话我的小应用程序。

Basically, I'm trying to get IAudioSessionManager2 & IAudioSessionNotification working together to inform my little app of every new audio session created.

警句code（公共的 IAudioSessionNotification ）：

Punchline code in AudioListener (public IAudioSessionNotification):

//This is mostly lifted from MSDN
HRESULT STDMETHODCALLTYPE AudioListener::QueryInterface(REFIID riid, void** ppvObject)
{
    if(riid == __uuidof(IUnknown))
    {
        *ppvObject = (IUnknown*)this;
        return S_OK;
    }

    if(riid == __uuidof(IAudioSessionNotification))
    {
        *ppvObject = (IAudioSessionNotification*)this;
        return S_OK;
    }

    *ppvObject = NULL;

    return E_NOINTERFACE;
}

//m_hwnd, and WM_SESSION_CREATED are set to good values
//WM_SESSION_CREATEd via RegisterWindowMessage(...)
HRESULT STDMETHODCALLTYPE AudioListener::OnSessionCreated(IAudioSessionControl *pSession)
{
    PostMessage(m_hwnd, WM_SESSION_CREATED, (WPARAM)pSession, 0);

    return S_OK;
}

code注册我的听众：

Code registering my listener:

BOOL RegisterMonitor(HWND target)
{
    BOOL success = false;

    HRESULT res;
    IMMDevice* pDevice;
    IMMDeviceEnumerator* pEnumerator;

    SESSION_LISTENER = NULL;
    SESSION = NULL;

    res = CoInitialize(NULL);

    if(res != S_OK && res != S_FALSE)
        return false;

    SESSION_LISTENER = new AudioListener(target);

    res = CoCreateInstance(__uuidof(MMDeviceEnumerator), NULL, CLSCTX_ALL, __uuidof(IMMDeviceEnumerator), (void**)&pEnumerator);
    if(res != S_OK)  goto Exit;

    res = pEnumerator->GetDefaultAudioEndpoint(eRender, eMultimedia, &pDevice);
    if(res != S_OK)  goto Exit;

    res = pDevice->Activate(__uuidof(IAudioSessionManager2), CLSCTX_ALL, NULL, (void**)&SESSION);
    if(res != S_OK)  goto Exit;

    res = SESSION->RegisterSessionNotification(SESSION_LISTENER);
    if(res != S_OK)  goto Exit;

    success = true;

Exit:
    SAFE_RELEASE(pEnumerator);
    SAFE_RELEASE(pDevice);
    if(!success)
    {
        SAFE_RELEASE(SESSION_LISTENER);
        SAFE_RELEASE(SESSION);
    }

    return success;
}

RegisterMonitor（...）返回true，但永远没有收到任何通知。我已经通过启动轻微声音效果的小应用程序和触发它们（Soltaire，扫雷等）的测试，确认它们在 SndVol 显示当我期待看到一个通知。

RegisterMonitor(...) returns true, but no notifications are ever received. I've been testing by launching little apps with minor sound effects and triggering them (Soltaire, Minesweeper, etc.), confirming that they show up in SndVol when I'm expecting to see a notification.

基本上，没有人看到我在做什么错？

Basically, does anyone see what I'm doing wrong?

推荐答案

您在 RegisterMonitor 函数释放的会话管理器。一旦你释放了最后一个引用它被释放会话管理器，你将不会再收到会议通知。

You released the session manager in your RegisterMonitor function. Once you release the last reference to the session manager it is freed and you'll no longer receive session notifications.

请会话管理器对象还活着，它应该工作得很好。

Keep the session manager object alive and it should work just fine.

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